Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.5: Vortrag
Mittwoch, 11. März 2026, 10:45–11:00, HSZ/0004
Terahertz Spectroscopy of non-collinear magnetic state in ferrimagnetic iron garnet — •Tushar Baruah1, Andrzej Stupakiewicz2, Paul H. M. van Loosdrecht1, and Evgeny A. Mashkovich1 — 1II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany. — 2Faculty of Physics, University of Bialystok, Ciolkowskiego 1L, 15-245 Bialystok, Poland.
Data storage technologies and magnetic control research, in general, focuses primarily on magnets with anti-ferromagnetic exchange interactions for their ultrafast picosecond-scale dynamics. Among them, ferrimagnets are particularly appealing, as they combine high Terahertz (THz)-scale eigenfrequencies with the feasibility of ground state control. Non-collinear magnetic states in ferrimagnets exhibit complex spin dynamics, whose ultrafast behaviour remains partly understood. Using a table-top high-power broadband THz pump-optical probe setup integrated with a 10T superconducting magnet, we directly probe the field and temperature dependent spin dynamics in Bi-substituted Gadolinium iron garnet, which is a ferrimagnet with non-collinear magnetic state and a magnetic moment compensation point temperature. Our results show magnetisation dynamics in non-collinear state driven by overlap of exchange modes and THz cavity modes formed by multiple reflections inside the sample.
Keywords: Terahertz; Ultrafast; Spectroscopy; Magnetism; Dynamics